feat: Comprehensive support for complex generics, consts, and where clauses

[Wicpar]

Changes:

• Const Generics: Added full support for const N: usize parameters.
• Associated Lifetimes: Enabled support for lifetimes tied to associated types/traits.
• Where Clauses: Implemented logic to parse and propagate where clauses to generated subenums.
• Nested Generics Fix: Resolved an issue where generics nested deep within types (e.g., Vec<Option>) were not detected.
• Refactor: Replaced the simple extractor with a syn::visit::Visit implementation for robust AST traversal.

Closes:
#13, #28, #48

Issues that should have been closed previously:
#37